Special Issue; Products for Industrial Machinery - NTN

NTN TECHNICAL REVIEW No.742006
4.2 Temperature rise comparison test
To evaluate the running performance of the
keystone design, the temperature increase
characteristics were compared to those of the
conventional design.
As shown in Fig. 7, the temperature increase of the
keystone design was limited compared to the
conventional design. There was an approximately
10°C maximum difference in temperature increase
between the new and conventional designs. In
addition, after undergoing the test. The conventional
design exhibited smearing, something not apparent in
the keystone design (Fig. 8).
Test conditions
Loading condition
Radial load Fr= 69 kN
Rotation speed
Up to 2000 min -1
Lubricating oil
Turbine VG56
Lubricating system
Oil bath
Temperature rise on outer ring ˚C
70
60
50
40
30
20
10
New design
Conventional
design
0
0 500 1000
1500 2000 2500
Fig. 7 Temperature rise
Aborted when abnormal
vibration occurred.
Rotation speed min -1
Fig. 8 Bearing condition after test
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